<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            background: #e4f7fd61;
            border: 2px solid #0786ada1;
            border-radius: 8px;
            width: 940px;
        }
        
        ul {
            padding: 0;
            overflow: hidden;
            margin-right: -20px;
            margin-bottom: -20px;
            margin-top: 0;
        }
        
        .box li {
            float: left;
            width: 300px;
            height: 200px;
            margin-right: 20px;
            margin-bottom: 20px;
            list-style: none;
            text-align: center;
            line-height: 200px;
            background: rgba(146, 203, 230, 0.65);
            border-radius: 8px;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li>6</li>
            <li>7</li>
            <li>8</li>
            <li>9</li>
        </ul>
    </div>
</body>

</html>